气候变化领域集成服务门户(CCPortal): Trade-offs among transport, support, and storage in xylem from shrubs in a semiarid chaparral environment tested with structural equation modeling

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DOI	10.1073/pnas.2104336118
	Trade-offs among transport, support, and storage in xylem from shrubs in a semiarid chaparral environment tested with structural equation modeling
	Pratt R.B.; Jacobsen A.L.; Percolla M.I.; de Guzman M.E.; Traugh C.A.; Tobin M.F.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:33
英文摘要	The xylem in plants is specialized to transport water, mechanically support the plant body, and store water and carbohydrates. Balancing these functions leads to trade-offs that are linked to xylem structure. We proposed a multivariate hypothesis regarding the main xylem functions and tested it using structural equation modeling. We sampled 29 native shrub species from field sites in semiarid Southern California. We quantified xylem water transport (embolism resistance and transport efficiency), mechanical strength, storage of water (capacitance) and starch, minimum hydrostatic pressures (Pmin), and proportions of fibers, vessels, and parenchyma, which were treated as a latent variable representing “cellular trade-offs.” We found that xylem functions (transport, mechanical support, water storage, and starch storage) were independent, a result driven by Pmin. Pmin was strongly and directly or indirectly associated with all xylem functions as a hub trait. More negative Pmin was associated with increased embolism resistance and tissue strength and reduced capacitance and starch storage. We found strong support for a trade-off between embolism resistance and transport efficiency. Tissue strength was not directly associated with embolism resistance or transport efficiency, and any associations were indirect involving Pmin. With Pmin removed from the model, cellular trade-offs were central and related to all other traits. We conclude that xylem traits are broadly governed by functional trade-offs and that the Pmin experienced by plants in the field exerts a strong influence over these relationships. Angiosperm xylem contains different cell types that contribute to different functions and that underpin trade-offs. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Biomechanics; Capacitance; Carbohydrates; Cavitation; Drought
语种	英语
scopus关键词	starch; angiosperm; Article; controlled study; hydraulic conductivity; hydrostatic pressure; nonhuman; parenchyma; semiarid climate; shrub; species difference; structural equation modeling; water transport; xylem
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238427
作者单位	Department of Biology, California State University, Bakersfield, CA 93311, United States; Department of Biology, University of Houston, Downtown, Houston, TX 77002, United States
推荐引用方式 GB/T 7714	Pratt R.B.,Jacobsen A.L.,Percolla M.I.,et al. Trade-offs among transport, support, and storage in xylem from shrubs in a semiarid chaparral environment tested with structural equation modeling[J],2021,118(33).
APA	Pratt R.B.,Jacobsen A.L.,Percolla M.I.,de Guzman M.E.,Traugh C.A.,&Tobin M.F..(2021).Trade-offs among transport, support, and storage in xylem from shrubs in a semiarid chaparral environment tested with structural equation modeling.Proceedings of the National Academy of Sciences of the United States of America,118(33).
MLA	Pratt R.B.,et al."Trade-offs among transport, support, and storage in xylem from shrubs in a semiarid chaparral environment tested with structural equation modeling".Proceedings of the National Academy of Sciences of the United States of America 118.33(2021).